Introduce Decl::hasBody() and FunctionDecl::hasBody() and use them instead of getBody() when we are just checking the existence of a body, to avoid de-serialization of the body from PCH.

Makes de-serialization of the function body even more "lazier".

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@107768 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CodeGenModule.cpp b/lib/CodeGen/CodeGenModule.cpp
index 86aaf99..cb83ffd 100644
--- a/lib/CodeGen/CodeGenModule.cpp
+++ b/lib/CodeGen/CodeGenModule.cpp
@@ -1085,7 +1085,7 @@
     // If this class has a key function, use that to determine the linkage of
     // the vtable.
     const FunctionDecl *Def = 0;
-    if (KeyFunction->getBody(Def))
+    if (KeyFunction->hasBody(Def))
       KeyFunction = cast<CXXMethodDecl>(Def);
     
     switch (KeyFunction->getTemplateSpecializationKind()) {
@@ -1453,7 +1453,7 @@
   if (D->hasAttr<DLLExportAttr>()) {
     if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
       // The dllexport attribute is ignored for undefined symbols.
-      if (FD->getBody())
+      if (FD->hasBody())
         GA->setLinkage(llvm::Function::DLLExportLinkage);
     } else {
       GA->setLinkage(llvm::Function::DLLExportLinkage);